More popularity = More new features implemented fast = no time spent in refactoring/bugfixing = lots of technical debt (http://en.wikipedia.org/wiki/Technical_debt) = more bugs

Or, for example, on GitHub, each project Fork is as good for search ranking as maybe 10 Stars. So more stupid annoying long standing bugs ( which can be fixed in one line) + less unit tests = more Forks = more popularity

Also, if you ever finish your module with all needed functionality, without bugs and without making it bloatware. You won't have any more work to do, and people will think the module is "not supported any more", because "it's not updated several months". = no popularity